FCO-JFK-AMS. Good MR but I am sure not what the OP is doing

Given some of the routings and schedules I've been seeing recently on delta.dumb for PAID tickets, this would not surprise me, although there would probably be a 19 hour layover at JFK and a choice of a more expensive routing with 23 hours in ATL. Why do a one-day trip when DL can make it take two or three days? You might still have a fight to get more miles credited than the nonstop distance.